dinosn/mariadb-13-rce-lab ? reverse-engineered prompt

Build me a small local security lab for MariaDB that runs in Docker and comes with a couple of Python scripts to demonstrate the issue in a safe way on my own machine.

I want one setup that starts a stock MariaDB container, creates a low privilege test user, and includes a simple way to verify the problem by running a script against the database and writing a marker file inside the container. Please make it easy to start, test, and clean up, with clear README steps for someone who is not deeply technical.

If you need to check current MariaDB or Docker behavior, look up the latest docs online. Keep it focused on the local lab only, and make sure the scripts work against the provided container without requiring any extra manual setup beyond starting the compose file.